C# printDocument 标题打印居中

private void button1_Click(object sender, EventArgs e)
{
//打印
printDocument1.Print();
}

    private void printDocument1_PrintPage(object sender, PrintPageEventArgs e)
    {
        Font titleFont = new Font("新宋体", 10, FontStyle.Bold);//字体                
        Brush brush = new SolidBrush(Color.Black);//画刷        
        Point po = new Point(10, 10);  //坐标

        float left = e.PageSettings.Margins.Left;//打印区域的左边界
        float top = e.PageSettings.Margins.Top;//打印区域的上边界
        float width = e.PageSettings.PaperSize.Width - left - e.PageSettings.Margins.Right;//计算出有效打印区域的宽度
        float height = e.PageSettings.PaperSize.Height - top - e.PageSettings.Margins.Bottom;//计算出有效打印区域的高度


        int wid = e.PageSettings.PaperSize.Width;
        //标题
        string name = "99街区KTV";
        //这里想要居中打印标题
        e.Graphics.DrawString(name, titleFont, brush, 80 - name.Length + 2, 80 - name.Length + 2);

    }

以上是我的代码、我想要标题居中打印、用的是 printDocument控件 10 号字体、80mm热敏纸、printDocument怎么样获取纸宽等等、主要标题居中这个算法怎么做呢？有没有大神做过、能给个例子吗？求帮助、在线等